Ladder Logic (lad) for S7-300 and S7-400 Programming
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Description ATAN establishes the arc tangent value of a floating-point number. The result represents an angle in a radian measure within the range -π/2 ≤ output value ≤ +π/2 where π = 3.1415.... See also Evaluating the Bits of the Status Word. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: x x x x x 0 x x 1 Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 105 9 Move Instructions 9.1 MOVE Assign a Value Symbol MOVE IN ENO EN OUT Parameter Data Type Memory Area Description EN BOOL I, Q, M, L, D Enable input ENO BOOL I, Q, M, L, D Enable output IN All elementary data types with a length of 8, 16, or 32 bits I, Q, M, L, D or constant Source value OUT All elementary data types with a length of 8, 16, or 32 bits I, Q, M, L, D Destination address Description MOVE (Assign a Value) is activated by the Enable EN Input. The value specified at the IN input is copied to the address specified at the OUT output. ENO has the same logic state as EN. MOVE can copy only BYTE, WORD, or DWORD data objects. User-defined data types like arrays or structures have to be copied with the system function "BLKMOVE" (SFC 20). Status word BR CC 1 CC 0 OV OS OR STA RLO /FC writes: 1 - - - - 0 1 1 1 MCR (Master Control Relay) dependency MCR dependency is activated only if a Move box is placed inside an active MCR zone. Within an activated MCR zone, if the MCR is on and there is power flow to the enable input; the addressed data is copied as described above. If the MCR is off, and a MOVE is executed, a logic "0" is written to the specified OUT address regardless of current IN states. Move Instructions 9.1 MOVE Assign a Value Ladder Logic (LAD) for S7-300 and S7-400 Programming 106 Reference Manual, 04/2017, A5E41524738-AA Note When moving a value to a data type of a different length, higher-value bytes are truncated as necessary or filled up with zeros: Example: Double Word 1111 1111 0000 1111 1111 0000 0101 0101 Move Result to a double word: 1111 1111 0000 1111 1111 0000 0101 0101 to a byte: 0101 0101 to a word: 1111 0000 0101 0101 Example: Byte 1111 0000 Move Result to a byte: 1111 0000 to a word: 0000 0000 1111 0000 to a double word: 0000 0000 0000 0000 0000 0000 1111 0000 Example MOVE IN ENO EN OUT Q 4.0 I 0.0 MW10 DBW12 The instruction is executed if I0.0 is "1". The content of MW10 is copied to data word 12 of the currently open DB. Q4.0 is "1" if the instruction is executed. If the example rungs are within an activated MCR zone: • When MCR is on, MW10 data is copied to DBW12 as described above. • When MCR is off, "0" is written to DBW12. Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 107 10 Program Control Instructions 10.1 Overview of Program Control Instructions Description The following program control instructions are available: • ---(CALL) Call FC SFC from Coil (without Parameters) • CALL_FB Call FB from Box • CALL_FC Call FC from Box • CALL_SFB Call System FB from Box • CALL_SFC Call System FC from Box • Call Multiple Instance • Call Block from a Library • Important Notes on Using MCR Functions • ---(MCR<) Master Control Relay On • ---(MCR>) Master Control Relay Off • ---(MCRA) Master Control Relay Activate • ---(MCRD) Master Control Relay Deactivate • RET Return Program Control Instructions 10.2 ---(Call) Call FC SFC from Coil (without Parameters) Ladder Logic (LAD) for S7-300 and S7-400 Programming 108 Reference Manual, 04/2017, A5E41524738-AA 10.2 ---(Call) Call FC SFC from Coil (without Parameters) Symbol ---( CALL ) Parameter Data Type Memory Area Description BLOCK_FC BLOCK_SFC - Number of FC/SFC; range depends on CPU Description ---(Call) (Call FC or SFC without Parameters) is used to call a function (FC) or system function (SFC) that has no passed parameters. A call is only executed if RLO is "1" at the CALL coil. If --- (Call) is executed, • The return address of the calling block is stored, • The previous local data area is replaced by the current local data area, • The MA bit (active MCR bit) is shifted to the B stack, • A new local data area for the called function is created. After this, program processing continues in the called FC or SFC. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC Unconditional: writes: - - - - 0 0 1 - 0 Conditional: writes: - - - - 0 0 1 1 0 Program Control Instructions 10.3 CALL_FB Call FB from Box Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 109 Example MCRD I 0.0 I 0.1 MCRA CALL Q 4.0 . . . . . . FC10 . . . . . . CALL FC11 OPN DB10 . . . The Ladder rungs shown above are program sections from a function block written by a user. In this FB, DB10 is opened and MCR functionality is activated. If the unconditional call of FC10 is executed, the following occurs: The return address of the calling FB plus selection data for DB10 and for the instance data block for the calling FB are saved. The MA bit, set to "1" in the MCRA instruction, is pushed to the B stack and then set to "0" for the called block (FC10). Program processing continues in FC10. If MCR functionality is required by FC10, it must be re-activated within FC10. When FC10 is finished, program processing returns to the calling FB. The MA bit is restored, DB10 and the instance data block for the user-written FB become the current DBs again, regardless of which DBs FC10 has used. The program continues with the next rung by assigning the logic state of I0.0 to output Q4.0. The call of FC11 is a conditional call. It is only executed if I0.1 is "1". If it is executed, the process of passing program control to and returning from FC11 is the same as was described for FC10. Note After returning to the calling block, the previously open DB is not always open again. Please make sure you read the note in the README file. Program Control Instructions 10.3 CALL_FB Call FB from Box Ladder Logic (LAD) for S7-300 and S7-400 Programming 110 Reference Manual, 04/2017, A5E41524738-AA 10.3 CALL_FB Call FB from Box Symbol FB no. ENO EN The symbol depends on the FB (whether it has parameters and how many of them). It must have the EN, ENO, and the name or number of the FB. Parameter Data Type Memory Area Description EN BOOL I, Q, M, L, D Enable input ENO BOOL I, Q, M, L, D Enable output FB no. DB no. BLOCK_FB BLOCK_DB - - Number of FB/DB; range depends on CPU Description CALL_FB (Call a Function Block from a Box) executed if EN is "1". If CALL_FB is executed, • The return address of the calling block is stored, • The selection data for the two current data blocks (DB and instance DB) are stored, • The previous local data area is replaced by the current local data area, • The MA bit (active MCR bit) is shifted to the B stack, • A new local data area for the called function block is created. After this, program processing continues within the called function block. The BR bit is scanned in order to find out the ENO. The user has to assign the required state (error evaluation) to the BR bit in the called block using ---(SAVE). Status word BR CC 1 CC 0 OV OS OR STA RLO /FC Unconditional: writes: x - - - 0 0 x x x Conditional: writes: - - - - 0 0 x x x Program Control Instructions 10.3 CALL_FB Call FB from Box Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 111 Example MCRA . . . Q 4.0 OPN DB10 . . . . . . FB11 EN ENO DB11 . . . OPN DB10 The Ladder rungs shown above are program sections from a function block written by a user. In this FB, DB10 is opened and MCR functionality is activated. If the unconditional call of FB11 is executed, the following occurs: The return address of the calling FB plus selection data for DB10 and for the instance data block for the calling FB are saved. The MA bit, set to "1" in the MCRA instruction, is pushed to the B stack and then set to "0" for the called block (FB11). Program processing continues in FB11. If MCR functionality is required by FB11, it must be re-activated within FB11. The state of the RLO must be saved in the BR bit by the instruction ---(SAVE) in order to be able to evaluate errors in the calling FB. When FB11 is finished, program processing returns to the calling FB. The MA bit is restored and the instance data block of the user-written FB is opened again. If the FB11 is processed correctly, ENO = "1" and therefore Q4.0 = "1". Note When opening an FB or SFB, the number of the previously opened DB is lost. The required DB has to be reopened. Program Control Instructions 10.4 CALL_FC Call FC from Box Ladder Logic (LAD) for S7-300 and S7-400 Programming 112 Reference Manual, 04/2017, A5E41524738-AA 10.4 CALL_FC Call FC from Box Symbol FC no. ENO EN The symbol depends on the FC (whether it has parameters and how many of them). It must have EN, ENO, and the name or number of the FC. Parameter Data Type Memory Area Description EN BOOL I, Q, M, L, D Enable input ENO BOOL I, Q, M, L, D Enable output FC no. BLOCK_FC - Number of FC; range depends on CPU Description CALL_FC (Call a Function from a Box) is used to call a function (FC). The call is executed if EN is "1". If CALL_FC is executed, • The return address of the calling block is stored, • The previous local data area is replaced by the current local data area, • The MA bit (active MCR bit) is shifted to the B stack, • A new local data area for the called function is created. After this, program processing continues in the called function. The BR bit is scanned in order to find out the ENO. The user has to assign the required state (error evaluation) to the BR bit in the called block using ---(SAVE). If you call a function and the variable declaration table of the called block has IN, OUT, and IN_OUT declarations, these variables are added in the program for the calling block as a list of formal parameters. When calling the function, you must assign actual parameters to the formal parameters at the call location. Any initial values in the function declaration have no significance. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC Unconditional: writes: x - - - 0 0 x x x Conditional: writes: - - - - 0 0 x x x Program Control Instructions 10.4 CALL_FC Call FC from Box Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 113 Example MCRA . . . . . . Q 4.0 OPN DB10 . . . . . . FC10 EN ENO FC11 EN ENO The Ladder rungs shown above are program sections from a function block written by a user. In this FB, DB10 is opened and MCR functionality is activated. If the unconditional call of FC10 is executed, the following occurs: The return address of the calling FB plus selection data for DB10 and for the instance data block for the calling FB are saved. The MA bit, set to "1" in the MCRA instruction, is pushed to the B stack and then set to "0" for the called block (FC10). Program processing continues in FC10. If MCR functionality is required by FC10, it must be re-activated within FC10. The state of the RLO must be saved in the BR bit by the instruction ---(SAVE) in order to be able to evaluate errors in the calling FB. When FC10 is finished, program processing returns to the calling FB. The MA bit is restored. After execution of FC10, program processing is continued in the calling FB depending on the ENO: ENO = "1" FC11 is processed ENO = "0" processing starts in the next network If FC11 is also processed correctly, ENO = "1" and therefore Q 4.0 = "1" . Note After returning to the calling block, the previously open DB is not always open again. Please make sure you read the note in the README file. Program Control Instructions 10.5 CALL_SFB Call System FB from Box Ladder Logic (LAD) for S7-300 and S7-400 Programming 114 Reference Manual, 04/2017, A5E41524738-AA 10.5 CALL_SFB Call System FB from Box Symbol SFB no. ENO EN The symbol depends on the SFB (whether it has parameters and how many of them). It must have the EN, ENO, and the name or number of the SFB. Parameter Data Type Memory Area Description EN BOOL I, Q, M, L, D Enable input ENO BOOL I, Q, M, L, D Enable output SFB no. DB no. BLOCK_SFB BLOCK_DB - - Number of SFB; range depends on CPU Description CALL_SFB (Call a System Function Block from a Box) is executed if EN is "1". If CALL_SFB is executed, • The return address of the calling block is stored, • The selection data for the two current data blocks (DB and instance DB) are stored, • The previous local data area is replaced by the current local data area, • The MA bit (active MCR bit) is shifted to the B stack, • A new local data area for the called system function block is created. Program processing then continues in the called SFB. ENO is "1" if the SFB was called (EN = "1") and no error occurs. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC Unconditional: writes: x - - - 0 0 x x x Conditional: writes: - - - - 0 0 x x x Program Control Instructions 10.6 CALL_SFC Call System FC from Box Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 115 Example MCRA . . . . . . Q 4.0 OPN DB10 . . . SFB 8 EN ENO REQ DONE ID ERROR R_ID STATUS SD_1 SD_2 SD_3 SD_4 M11.0 READY M10.0 DB 8 CODE DW12 DW14 DW16 OPN DB10 The Ladder rungs shown above are program sections from a function block written by a user. In this FB, DB10 is opened and MCR functionality is activated. If the unconditional call of SFB8 is executed, the following occurs: The return address of the calling FB plus selection data for DB10 and for the instance data block for the calling FB are saved. The MA bit, set to "1" in the MCRA instruction, is pushed to the B stack and then set to "0" for the called block (SFB8). Program processing continues in SFB8. When SFB8 is finished, program processing returns to the calling FB. The MA bit is restored and the instance data block of the user-written FB becomes the current instance DB. If the SFB8 is processed correctly, ENO = "1" and therefore Q4.0 = "1". Note When opening an FB or SFB, the number of the previously opened DB is lost. The required DB has to be reopened. Program Control Instructions 10.6 CALL_SFC Call System FC from Box Ladder Logic (LAD) for S7-300 and S7-400 Programming 116 Reference Manual, 04/2017, A5E41524738-AA 10.6 CALL_SFC Call System FC from Box Symbol SFC no. ENO EN The symbol depends on the SFC (whether it has parameters and how many of them). It must have EN, ENO, and the name or number of the SFC. Parameter Data Type Memory Area Description EN BOOL - Enable input ENO BOOL - Enable output SFC no. BLOCK_SFC - Number of SFC; range depends on CPU Description CALL_SFC (Call a System Function from a Box) is used to call an SFC. The call is executed if EN is "1". If CALL_SFC is executed, • The return address of the calling block is stored, • The previous local data area is replaced by the current local data area, • The MA bit (active MCR bit) is shifted to the B stack, • A new local data area for the called system function is created. After this, program processing continues in the called SFC. ENO is "1" if the SFC was called (EN = "1") and no error occurs. Status word BR CC 1 CC 0 OV OS OR STA RLO /FC Unconditional: writes: x - - - 0 0 x x x Conditional: writes: - - - - 0 0 x x x Program Control Instructions 10.6 CALL_SFC Call System FC from Box Ladder Logic (LAD) for S7-300 and S7-400 Programming Reference Manual, 04/2017, A5E41524738-AA 117 Example MCRA . . . . . . Q 4.0 OPN DB10 . . . . . . SFC20 EN ENO SRCBLK RET_VAL DSTBLK DBDW12 MW10 MOTOR.SPEED The Ladder rungs shown above are program sections from a function block written by a user. In this FB, DB10 is opened and MCR functionality is activated. If the unconditional call of SFC20 is executed, the following occurs: The return address of the calling FB plus selection data for DB10 and for the instance data block for the calling FB are saved. The MA bit, set to "1" in the MCRA instruction, is pushed to the B stack and then set to "0" for the called block (SFC20). Program processing continues in SFC20. When SFC20 is finished, program processing returns to the calling FB. The MA bit is restored. After processing the SFC20, the program is continued in the calling FB depending on the ENO: ENO = "1" Q4.0 = "1" ENO = "0" Q4.0 = "0" Yüklə 1,39 Mb. Dostları ilə paylaş:
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